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Dylan Klebold and Eric Harris are arrested after stealing items from a van. After pleading guilty, they are sent to a juvenile diversion program
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Randy and Judy Brown, parents of student Brooks Brown, file a report with the sheriff's office stating that Harris has threatened to kill Brooks and had written on the internet that he would like to kill people.
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At approximately 11:19 am., two students, Dylan Klebold, 17, and Eric Harris, 18, carrying guns and bombs, open fire inside Columbine High School, killing 13 and wounding 23 others before killing themselves.
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Mark Manes is sentenced to six years in prison for selling a gun used in the murders to minors Harris and Klebold
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Close to three dozen families of Columbine victims settle suits with the parents of the suspects and gun suppliers. The settlement totals close to $2.5 million The Harris' and Klebold's homeowners insurance will pay a large part and the rest will come from insurance company payments on behalf of the gun suppliers. The family of victim, Isaiah Shoels does not accept the settlement.
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The Jefferson County Sheriff's Office settles with the daughter of teacher Dave Sanders for $1.5 million
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Judge Robert Blackburn orders the family of Isaiah Shoels to accept a $366,000 settlement in the lawsuit against the gunmen's families.
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A home video of the two suspects is released by authorities. In the video, made six weeks before the murders, the suspects are seen in a forested area shooting at bowling pins.
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Colorado Attorney General Ken Salazar releases an investigative report about the attack. Authorities also release thousands of pages of documents and physical evidence.
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The Columbine Memorial, adjacent to Columbine High School, is dedicated and opened to the public.
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In the first television interview since her son Dylan killed 13 people at Columbine High School, Susan Klebold speaks to Diane Sawyer. Klebold states that "If I had recognized that Dylan was experiencing some real mental distress, he would not have been there," she says. "He would've gotten help. I don't ever, for a moment, mean to imply that I'm not conscious of the fact that he was a killer, because I am."